Advertisements
Advertisements
प्रश्न
How many eggs are released by a human ovary in a month? How many eggs do you think would have been released if the mother gave birth to identical twins? Would your answer change if the twins born were fraternal?
Advertisements
उत्तर
Each ovary produces several immature eggs, which are connected with groups of other cells known as follicles. In humans, only one egg is usually removed at a time; however, two or more may emerge during the menstrual cycle. The egg emerges from the ovary between the 14th and 16th days of the typically 28-day menstrual cycle. Fertilisation of a single egg results in one zygote (monozygotic) that divides into two embryos, forming identical twins. If the twins were born fraternal, two eggs would be released. Fraternal twins (also known as non-identical twins) are typically formed when two fertilised eggs are implanted in the uterine wall at the same time. The two eggs produce two zygotes; hence, these twins are also known as dizygotic or binovular twins.
APPEARS IN
संबंधित प्रश्न
Write two major functions of ovary.
Differentiate between the following pair:
Uterus and vegina
Differentiate between:
Implantation and pregnancy
Complete the paragraph with the help of words given in the bracket.
(Luteinizing hormone, endometrium of uterus, follicle stimulating hormone, estrogen, progesterone, corpus luteum)
Growth of follicles present in the ovary occurs under the effect of ______. This follicle secretes estrogen. ______ grows/regenerates under the effect of estrogen. Under the effect of ______, fully grown up follicle bursts, ovulation occurs and ______ is formed from remaining part of follicle. It secrets ______ and ______. Under the effect of these hormones, glands of ______ are activated and it becomes ready for implantation.
Sketch the labelled diagram.
Human female reproductive system.
The diagram given below represents a system in the human body. Stud the diagram and answer the following questions:
Label the parts marked 5 and 6.
Choose the correct answer:
The onset of menstruation in the female is termed __________
Explain the term Graffian follicle.
Give Technical Term:
Which part develops during the advanced pregnancy?
Write the functional activity of the following structure:
Fallopian tubes
The largest cell in the human body of a female is ______.
The pair of thin folds present inner to the labia majora is ____________.
How many lobes are generally present in each mammary gland?
The follicular fluid present in the antrum is secreted by ______
Egg is liberated from ovary in ______.
Ovulation occurs under the influence of ______.
In oocyte secondary maturation occurs in ______.
Which of the following is correct about mammalian testes?
The finger-like projections, called fimbriae, help in the collection of ovum into the fallopian tube following ovulation.
To answer the question, study the graphs below for Subjects 1 and 2 showing different levels of certain hormones.
For subject 2 it is observed that the peak for hormone B has reached the plateau stage. After approximately how much time will the curve for hormone B descend?
Read the following and answer from given below:
During copulation, semen is released by the penis into the vegina. The motile sperms swim rapidly, fuse with the ovum in the ampullary region, resulting in fertilization. The haploid nucleus of sperm fuses with that of the ovum to form a diploid zygote.
Site of fertilization in human is ______
What is placenta? Mention its role during pregnancy?
How can we say that fish exhibits external fertilisation?
Draw a neat diagram of the female reproductive system and label the parts associated with the following:
(a) production of gamete
(b) site of fertilisation
(c) site of implantation
(d) birth canal
Bartholin's glands are homologous to ______.
List two roles of the Oviduct in the human reproductive system.
